Safety and relief valve



Feb. 8, 1938. A. L. KRONQUEST 2,107,704

SAFETY AND RELIEF VALVE Filed Feb. 4, 1935 awe/1m Mm LA 2 Gum/M441 Patented, Feb. 8,192 38 f I UNITED STATES PATENT orncs Alfred L. Kronquest, Syracuse, N. Y., assignor to Continental Can Company, Inc;, New York, N. Y., a corporation of New York Application February 4, 1935, Serial Nb. 4,951 2 Claims. (Cl. 137- 53) The present invention relates to newand use- The invention will now be described indetail, iul improvements in valves and more particureference being had to the accompanying drawlarly to an improved valve which may be posiing. The valve may be employed wherever such tively opened to serve as a safety blow-oil valve valves are commonly used, but it is particularly or which may be used as an automatic relief adapted for use in connection with a pressure 5 valve for excessive pressure. cooker, a fragmentary portion of which is indi- An object of the present invention is to pro- .cated at ill. The member i0 is provided with vide an improved valve, of the type referred to, a threaded opening which is adapted to receive wherein the valve means is independently inovthe threaded end ll of the nipple or coupling able with respect to the opening means. plug I 2. The plug or nipple I2 is provided with 10 Av further object of the invention is to provide a wrench receiving flange l3 and an upper an improved valve, of the type referred to, coarsely threaded portion It. A passage i5 exwherein the valve opening means carries a spring tends centrally through the plug' l2 from end pressed valve member which is independently to end and thus communicates with the vessel movable with respect to said opening means Ill so that fluid under pressure may pass there- 16 when serving as an automatic relief-valve, but through. The upper end of the plug I2 is outwhich is positively moved and held by said openwardly tapered, as at l6, and provides a valve ing means when the valve serves as a blow-oil seat. a valve. I A closed sleeve or thimble member ll having 20 The above and other objects of the invention a central bore I8 is provided with a threaded 20 will in part be obvious and will be hereinafter portion l9 which is adapted to be screwed on the more fully pointed out. a threaded portion ll of the plug l2. The thimble In the accompanying drawing:' i1 is provided with a plurality of radial open- Fig. 1 is an enlarged top plan view of the valve. ings 20 which communicate with the central bore 5 Fig. 2 is a reduced side view of the same. l8 and which are disposed adjacent the valve Fig. 3 is a" reduced sectional view, taken along seat on the plug l2 when the thimble is threaded the line 3-3 of Fig. 1, showing the valve in a thereon. The thimble i1 is provided with a deposition to serve as'a' relief valve. pending skirt or flange 2| extending partially Fig. 4 is a similar sectional view showing the around thesame, which affords shoulders 2m,

valve in a position to serve as a blow-oil or safety 2 lb for cooperation with a stop pin 22 mounted 30 valve. in the flange l3 of the plug l2 in a manner to The invention relates generally to an improved be hereinafter more fully described. A helical valve which may be used with pressure cookers spring 23 is inserted within the bore It in the although it is to be clearly understood that the thimble H. A ball valve 24 is also inserted so valve may be used for various other applications. that the spring constantly urges the ball down- 35 The valve is one which maybe employed as a wardly. The metal on the thimble l'l around pressure relief valve or which may be adjusted the intersection between the bore l8 and the rato serve as a safety blow-off valve. It consists dial openings 20 is crimped inwardly, as shown of a hollow coupling member which is fitted on at 25, to form a peripheral edge of slightly less 40 the cover of the cooker or other device and an diameter than the diameter'of the ball 24 so as 40 operating or opening member which threadedly to prevent it from falling out of the thimble. engages the coupling member. The operating This crimped portion 25 thus serves as a stop to member carries a spring pressed valve. When retain the ball 24. It is to be clearly understood the operating member is in one position, the that any form of movable valve may be employed .45 valve member is spring pressed onto a valve seat and that a ball valve is shown for purposes of on the coupling member and serves as a relief illustration only. valve to relieve the pressure after it has reached The valve is positioned on the cooker ID with a predetermined amount. In this position the the end ll thereof threaded into the opening in valve member operates independently of the opthe top of the cooker. When it is desired that crating member. The operating member may be the device serve as an automatic pressure relief 50 turned, and thus moved relative to the coupling valve, the thimble or operating member I! is member, in order to positively move the valve turned so that the edge 2 la of the depending member from the valveseat so that the device skirt 2| abuts against the limiting stop pin 22, may serve as a blow-off valve permitting the as shownin Fig. 3. I thisposition of the thim- .free passage of fluid under pressure. ble, the ball 24 is urged against the valve seat 55 a certain predetermined I 6 on the plug 12 by the spring 23, the inwardly directed portion 25 of the thimble I! being out of contact with the ball. The spring is under a tension necessary to keep the ball seated. up to pressure but to permit it to rise from the seat 5 independently of the thimble as the pressure in the cooker exceeds this predetermined amount, so that the valve acts as a relief valve for excessive pressure, the fluid escaping through the passage l5 and the radial openings 20 in the thimble. When it is desired that the device serve as a safety blowofi valve, the thimble may be turned so that the opposite edge Nb of the skirt 2! abuts against the pin 22, as shown in Fig. 4. In this raised position of the thimble H, the crimped portion 25 will grasp the ball 2 and positively lift it from the valve seat IG- as the thimble is raised. In this position the device serves as a safety blow-off valve wherein there is a free passage from the cooker through the aperture l5 and the parts 20.

From the foregoing description, it will be seen that a highly efficient valve is herewith provided and one which is simple in construction and easy to operate. Of course minor changes in the details of construction and arrangement of parts may be made'without departing from the scope of the invention .as set forth in the appended claims.

I claim:

1. A combined safety and relief valve'comprising a coupling plug having a passage "therethrough with a valve seat-at the outer end there passage, said cap member having means disposed.

above said valve seat for positively raising said ball valve from said seat and for preventing removal of said ball valve, and stop means for limiting rotation of said cap member in. either direction and including a depending skirt portion on said cap member extended partially around the same for providng stop shoulders and a stop pin carried by said coupling plug and cooperating with the shoulders on said skirt portion for limiting rotation of said cap member, said ball valve being movable independently of said cap member against the action of the spring when in engagement with said valve seat to permit relief of excess pressure.

2. A combined safety and relief valve Y as claimed in claim 1, wherein said cap member is provided with an inwardly crimped edge around the recess therein and above said valve seat for positively engaging and raising said ball valve from said seat and for preventing removal of said ball valve from the recess.

ALFRED L. KRONQUEST. 

